21089840

素因数分解:

$2^4\times 5^1\times {\mathrm{47}}^1\times {\mathrm{71}}^1\times {\mathrm{79}}^1$

素因数の和:210

約数の個数: 80

約数和(自身を含む): 51425280

約数和(自身を除く): 30335440

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 47, 71, 79, 80, 94, 142, 158, 188, 235, 284, 316, 355, 376, 395, 470, 568, 632, 710, 752, 790, 940, 1136, 1264, 1420, 1580, 1880, 2840, 3160, 3337, 3713, 3760, 5609, 5680, 6320, 6674, 7426, 11218, 13348, 14852, 16685, 18565, 22436, 26696, 28045, 29704, 33370, 37130, 44872, 53392, 56090, 59408, 66740, 74260, 89744, 112180, 133480, 148520, 224360, 263623, 266960, 297040, 448720, 527246, 1054492, 1318115, 2108984, 2636230, 4217968, 5272460, 10544920, 21089840]

約数ペア:

[(1, 21089840), (2, 10544920), (4, 5272460), (5, 4217968), (8, 2636230), (10, 2108984), (16, 1318115), (20, 1054492), (40, 527246), (47, 448720), (71, 297040), (79, 266960), (80, 263623), (94, 224360), (142, 148520), (158, 133480), (188, 112180), (235, 89744), (284, 74260), (316, 66740), (355, 59408), (376, 56090), (395, 53392), (470, 44872), (568, 37130), (632, 33370), (710, 29704), (752, 28045), (790, 26696), (940, 22436), (1136, 18565), (1264, 16685), (1420, 14852), (1580, 13348), (1880, 11218), (2840, 7426), (3160, 6674), (3337, 6320), (3713, 5680), (3760, 5609)]